/Engine/Plugins/Web/HttpBlueprint/Source/HttpBlueprint/Public/HttpBlueprintFunctionLibrary.h
HeaderObject: The structure that contains all of the headers  NewHeader: The name of the header  NewHeaderValue: The value of the new header
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Http") static void AddHeader ( [FHttpHeader](API\Plugins\HttpBlueprint\FHttpHeader) & HeaderObject, [FString](API\Runtime\Core\Containers\FString) NewHeader, [FString](API\Runtime\Core\Containers\FString) NewHeaderValue )